Patent GB-385111-A (GB)
Title: Improvement in reinforcing cinematograph films
IPC: G03D15/00
Filed: 1931-12-21
Abstract: 385,111. Making record sheets. ARMOURED FILMS, Ltd., Dorland House, Regent Street, London.-(Assignees of Pedersen, N. ; 533, N. 11 Street, Philadelphia, U.S.A.) Dec. 21, 1931, No. 35291. Convention date, Dec. 23, 1930. [Classes 83 (ii) and 83 (iv).] Punching ; embossing.-Armoured film is produced by attaching to the edges of the film already provided with sprocket holes armour strips having sprocket apertures spaced by the same distance as the apertures in the developed film and uniting the film and armour strips according to the average of a number of spaces between apertures. As shown in Fig. 24, the machine comprises three sections, sprocket holes and rivet protuberances being formed in the armour strips Al, A2 at station 1, rivet holes being punched in the film at station 2, and the film and armour strips being assembled at station 3 by the piercing of the rivet protuberances whilst projecting through the rivet holes in the film and by the flattening of the burrs on the film. As shown in Fig. 5, the presses each comprise an eccentric 140 operating in bearings 141 secured to a rod 142 connected by a ball-and-socket joint to a crosshead 146 reciprocating in guides 148. Beneath the cross-head is a punch-holder 156 co-operating with a die-holder 159 bolted to the table, guide studs in the one coacting with apertures in the other. The apparatus is driven from an electric motor with intervening changespeed and clutch mechanism. The armour strips A1, A2 travel from braked reels from station 1 to station 3, passing through crossed tubes to effect reversal, the film F being also taken from a braked reel. The strip-feeding mechanism is driven by a shaft connected at one end to the press shaft and at the other through gearing to a shaft 199, as shown in Fig. 8, carrying a cam 203 operating two rollers 204, 205 to cause the pins 206 to feed the film. The pins 206 are secured by a clamp 207 to a bar 209 secured to the outer ends of the arms 210 pivoted to a lever 212, the arms 210 and the lever 212 being urged towards the cam by the springs 214, 215 respectively. The feed is adjusted by a knob operating through worm gearing an eccentric 224 on the shaft 225 supporting the cam roller 205, the shaft 225 carrying a pointer co-operating with a shrinkage scale. A registering device comprises pins 235 pressed by springs 238 to cause the ends 236 to enter the sprocket holes, and may be adjusted by a screw 245 rotatable in a fixed bearing 246 and threaded into a nut 247 fixed to a slide plate carrying the pins. As shown in Fig. 12, the punching apparatus at station 1 comprises positioning pins 250, sprocket hole punches 251 and rivet protuberance punches 252, the die blocks 253 having co-operating holes 254, 255, 256 respectively. The pins 250 are mounted in a block 257 secured to an adjustable block 259. The punches 251 fit in bores 262 in a block 263, adjusting and locking screws 265, 266 holding the punches 251 against backward movement. The punches 252 are mounted in a block 267 secured to a block 263. On the die holder 159 is a rest 270 on which, at either side, are the die blocks 253. A backing pin 274 is pressed by a spring 275 into coaction with the rivet punch 252. The die blocks have recesses and grooves for receiving the protuberances after punching. The strips are guided laterally by guide plates 280 coacting with which is a clamp plate 286 mounted as shown in Fig. 17, on spring-pressed studs 287. The positioning pins are adjusted by moving the block 259 against springs 295 by a screw 299 provided with a knob 301 having a scale 302 calibrated in percentage sprocket space length, clamping being effected by screws. The initial starting mechanism comprises upper rolls 311 urged by springs against a lower roll 315 having a shaft 313 provided with a knob 314. The release means comprises cams 325 on the shaft 326 rotatable either by a knob or by a striker arm 328 to raise the upper rollers clear of the lower roll. The striker arm is operated to separate the rolls on each downward movement of the press by the stud 331. Backlash plungers 333 secured to the punch-holder 156 coact with springs in the die-holder 159. The mechanism for punching rivet holes in the film at station 2 comprises a punch-holder 156 on which is a block 342 to which are attached blocks 343 integral with which are the positioning pins 345. Rivet hole punches 347 are secured in V-shaped seats formed partly in the block 342 and partly in blocks 348. A die anchor block secured to a rest secured to the die-holder 159 has secured thereto die blocks 357 provided with holes 359, 360 for the positioning pins and punches respectively. Film retaining plates 363 are secured to the die anchor block. As shown in Fig. 20, the assembling mechanism at station 3 comprises a punch-holder 156 on which is an anchor block 368 beneath which is a punch block 369 supporting the positioning pins 371 and rivet turning punches 372. An upper strip holding plate 375 is held on studs 376 mounted in bores 377 in the block 368, the springs 378 holding the plate 375 down. Secured to the block 368 is a rivet flattening punch 381 co-operating with an anvil 384. The die rest 387 secured to the die-holder 159 carries a punch block 389 holding rivet piercing punches 391 and having recesses 392 receiving the ends of the positioning pins 371. A strip guide plate 395 is secured to the studs 396 slidable in bores 397 in the die rest 387 and forced upwards by the springs 398. The guide plate has die holes 399 co-operating with the rivet turning punches 372 while the plate 375 has die holes 400 co-operating with the punches 391. The plungers 404 secured in the punch-holder 156 rest on springs 406 in the die-holder 159. As shown in Fig. 26, the shrinkage measuring apparatus comprises a base 20 carrying a fixed pin 21 at one end and a pin 22 at the other on a pointer 23 moving over a scale 25 of percentage shrinkage. Three intermediate pins 28, 29, 30 movable only to a limited degree are provided to ensure that the maximum shrinkage between two pins does not amount to one sprocket hole space, so that the pin 22 always enters the same sprocket hole.